docs(config): add advanced incontent ads specification
- proposal.md: define problem and expected changes
- design.md: 9 technical decisions with rationale
- spec.md: complete GIVEN/WHEN/THEN scenarios
- tasks.md: implementation tasks with dependencies
Features specified:
- 7 ad insertion locations (H2, H3, p, img, lists, blockquotes, tables)
- 5 density modes (legacy, conservative, balanced, aggressive, custom)
- 2 selection strategies (position vs priority)
- Deterministic probability with daily seed
- Backward compatibility with legacy fields
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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